Make sure the blade guides aren't trashed. They can be hard to find for old or import models, or just expensive. If it's a quality saw like a DoAll or RollIn or Ellis you should be able to get parts, but the price should reflect the need.
As said, make sure it cuts square. Take at least a piece of 2" square tube, preferably 1/4" wall. Do a cut and then put a tri-square to it. If it's off you'll have to decide if the guides simply need adjustment, or if they need replaced.
If it has a coolant pump that should work or, again, the price should be reflective.
Unless you have a good source locally for blade welding, it should take a blade length that is common and readily available.